Owner`s manual
Chapter 4 - Troubleshooting
39
4.3.5 DSU Loopback Test
This test lets you verify proper MT56DSU-R operation by matching
a transmitted signal to the "looped-back" receive signal. Refer to
Appendix B for cable description.
1. Obtain a DSU Loopback cable (CADSURLB) from Multi-Tech, or
assemble one. Refer to Appendix B for instructions on building
the Loopback cable .
2. Plug the Loopback cable into the DB9 connector on the DSU
being tested.
3. If you send data from your DTE, it should be "looped back" to
your DTE. If you have access to a Bit Error Rate Tester, this
can be used in place of the DTE.
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